Nothing happens when a CreateThingGroupCommand is sent using aws-sdk-js-v3

I have created a JS lambda via Amplify using the NodeJS 20.x runtime. The lambda gets triggered by a DyanmoDb stream when a new item is created in a table. When a new item is created I want the lambda to use the content of the item to create a new ThingGroup in IoT Core. To create the ThingGroup I use the aws-sdk-js-v3 library and the CreateThingGroupCommand.

My lambda code looks like this:

import { unmarshall } from "@aws-sdk/util-dynamodb";
import { IoTClient, CreateThingGroupCommand } from "@aws-sdk/client-iot";

/**
 * @type {import('@types/aws-lambda').APIGatewayProxyHandler}
 */
export const handler = async (event) => {
  try {
    // Setup an IotClient
    const client = new IoTClient({ region: process.env.REGION });

    // Get all records with new and old data from incoming event
    const records = event.Records.map(record => ({
      new: unmarshall(record.dynamodb.NewImage)
    }));

    records.forEach(async record => {
        let thingGroupName = record.new.name;
        let thingGroupDescription = 'Thing group for ' + record.new.name;

        const params = {
          thingGroupName: thingGroupName,
          thingGroupProperties: {
            thingGroupDescription: thingGroupDescription,
          },
        };

        try {
          const command = new CreateThingGroupCommand(params);
          const response = await client.send(command);
          console.log('New IoT Core ThingGroup created!');
          console.log(response);
        } catch (error) {
          console.log('Failed to create new IoT Core ThingGroup!');
          console.log(error);
        }
      }      
    });

    return {
      statusCode: 200,
      body: JSON.stringify({ message: "Successfully create new ThingGroup!" }),
    };

  } catch (error) {
    console.log('Failed to process DynamoDb stream with error: ', error);

    return {
      statusCode: 500,
      body: JSON.stringify({ message: "Failed to process DynamoDb stream" }),
    };
  }
};

I have a policy that I have attached to the role the lambda is using that look like this:

{ "Version": "2012-10-17", "Statement": [ { "Action": [ "iot:CreateThingGroup" ], "Resource": [ "*" ], "Effect": "Allow" } ] }

When the lambda is triggered by the DynamoDb stream it gets the data from the stream, setup the CreateThingGroupCommand but then when it performs the const response = await client.send(command); nothing more happens. The next line that has the console.log('New IoT Core ThingGroup created!'); never executes and there is no exception that is caught, the lambda just terminates.

There is no ThingGroup created with the name from the stream.

I can't find any more data in the LogGroup for the lambda or in the any CloudTrail event history that informs me of what might have gone wrong.

Is there anything else I could do to track down what is going wrong or can anyone see what could potentially be wrong with my code?